MOHAMED, M., ABDEL AZEEM, S., KHAIRY, A., GABR, M., EL-BARODY, M., ABD EL-NABY, A. (2012). EFFECT OF L-TYROSINE ORAL ADMINISTRATION TO GROWING OSSIMI LAMBS. Egyptian Journal of Agricultural Research, 90(1), 383-393. doi: 10.21608/ejar.2012.159784
MAHMOUD Y. MOHAMED; SAFAA N. ABDEL AZEEM; ABDEL-MOATY K. KHAIRY; MOHAMED G. GABR; MOHAMED A. EL-BARODY; ABD EL-HADY A. ABD EL-NABY. "EFFECT OF L-TYROSINE ORAL ADMINISTRATION TO GROWING OSSIMI LAMBS". Egyptian Journal of Agricultural Research, 90, 1, 2012, 383-393. doi: 10.21608/ejar.2012.159784
MOHAMED, M., ABDEL AZEEM, S., KHAIRY, A., GABR, M., EL-BARODY, M., ABD EL-NABY, A. (2012). 'EFFECT OF L-TYROSINE ORAL ADMINISTRATION TO GROWING OSSIMI LAMBS', Egyptian Journal of Agricultural Research, 90(1), pp. 383-393. doi: 10.21608/ejar.2012.159784
MOHAMED, M., ABDEL AZEEM, S., KHAIRY, A., GABR, M., EL-BARODY, M., ABD EL-NABY, A. EFFECT OF L-TYROSINE ORAL ADMINISTRATION TO GROWING OSSIMI LAMBS. Egyptian Journal of Agricultural Research, 2012; 90(1): 383-393. doi: 10.21608/ejar.2012.159784
EFFECT OF L-TYROSINE ORAL ADMINISTRATION TO GROWING OSSIMI LAMBS
1Animal Production Research Institute, Agricultural Research Center, Ministry of Agricultural, Doki, Giza, Egypt.
2Faculty of Agriculture, Minia University, Egypt.
Abstract
The objective of this study was to determine the effect of Ltyrosine oral administration (100 mg/kg B.W.) on growing lambs performance from weaning till puberty. Growth performance till sexual activity, testes circumference, urethral process length, semen characteristics, testosterone and thyroid hormones levels were recorded. Thirty-two ram lambs and ewe- lambs were randomly divided into two equal groups, the first group (n=8♂ & 8♀) was treated by L-tyrosine, and the second group (n=8♂ & 8♀) was untreated and served as control. These animals were born in the lambing season of autumn (September/October 2007). Ewe-and ram-lambs were weighed monthly. The ewe-lambs were kept with the ram lambs during the experimental period. Blood samples were collected at 0, 6, 8 and 10 months post-weaning from ram-lambs to determine levels of testosterone, triiodothyronine (T3) and thyroxine (T4) hormones concentrations in plasma. Also, blood samples were collected at the same time from ewe-lambs to determine levels of T3 and T4. The results revealed that lambs treated with L-tyrosine attained puberty at younger ages and heavier body weights compared to the untreated ones. Total gain and daily gain in both ram-and ewe lambs were increased significantly in treated lambs compared to the control. Triiodothyronine (T3) concentration was increased significantly (P<0.05), while, thyroxine (T4) concentration was increased insignificantly in blood plasma by administration of Ltyrosine. Also, thyroid hormones concentrations were increased significantly (P<0.01) by progressing in age until they reached the highest concentrations at ten months old. Moreover, testes circumference and urethral process length were insignificantly increased, but, libido was improved significantly (P<0.01) in treated ram- lambs compared to the control group. Testosterone hormone concentration was increased significantly (P<0.05) in treated ramlambs compared with the control group. Most of the physical semen properties were improved significantly (P<0.01) in treated ramlambs. Finally, L-tyrosine oral treatment was accompanied with better economic returns.
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